Can't fit plane to nurbs path to create a race track
Make the curve and plane have the same origin point. Apply transformations (Ctrl+A-->Rotation &amp; Scale) in Object Mode to both objects. Subdivide the plane with loopcuts in Edit Mode (Ctrl+R). Give the plane the Curve Modifier and set the Path as a target. Choose the right deformation axis. Then go to the Curve header and check the Stretch and Bound Clamps checkboxes in a Shape panel.


To make te plane more detailed along a curve subdivide the plane with W-->Subdivise or add more edgeloops at the start. 




EDIT: Deleted unnecessary points of your curve path and it works fine. Remember to use apply modifier while in edit mode option. It's very helpful in this case.


Here's the .blend: